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The problem with tel: is that most browsers don't know what to do with that, so they see it as a URL relative to your site, and when you try http://www.google.com/tel:1231231234 there is no such thing and of course, you get a 404 error.

So here is another gotcha that we will all have to cater for in our robots files and .htaccess files.

What you need to do, to handle that, is to detect that you are dealing with a smart browser that understands what to do with it, and only display those anchor links to those browsers.

The upside, of course, is that either robots or hopefully, real people are clicking on your phone links.

The downside is that if they are real people and they get a 404 error, you are giving them a bad surfing experience.

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